Impact-tool head.



W. J. BERNETT'. IMPACT TOOL HEAD.

APPLICATION FILED SEPT-'18. 1913.

Patented Feb. 1, 1916.

IN VENTOI? THE COLUMBIA PLmyoGnAm-l co., WASHINGTON, n. c.

WILLIS J. BERNETT, 01E KANSA$ CITY, MISSOURI, ASSIGNOR T WILLIAM B.THAYER, OF KANSAS CITY, E'IISSOUHI.

IMPACT-TOOL nnan.

Application filed September 18, 1913.

T0 aZZ whom it may concern Be it known that l, /ViLLrs J. Barnum, acitizen of the United States, residing at Kansas City, in the county ofJackson and State of Missouri, have invented certain new and usefulimprovements in Impactlool Heads; and I do declare the following to bea. full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanying drawings, and to theletters and figures of reference marked thereon, which form a part ofthis specification.

My invention relates to an impact tool head, and more particularly to amechanism for actuating a rock drill, riveting hammer, or other tool,the function of which is to strike against the object upon which it isbeing used; the principal object of the invention being to provide asimple mechanical mechanism for imparting the impact blow to the tool.In accomplishing this object 1 have provided improved details ofstructure, the preferred forms of which are illustrated in theaccompanying drawings, vherein:

Figure l is a perspective view of animpact tool head constructedaccordingto my invention, and shown equipped with an ordinary rock drilland connected with a. flexible shaft through which power is transmittedto the working parts. Fig. 11 is a side view of the tool with the driveshaft cap removed to illustrate the cam mechanism for impartingreciprocatory motion to the impact mechanism. Fig. H1 is a centrallongitudinal section of the tool head.

Referring more in detail to the parts 1 designates a housingforcontaining the working parts of the device, and preferably comprisinga cylinder having cap flanges 2-3 at its opposite ends and having anenlarged port casing 4 inclosing the laterally opening port 5. Threadedinto the tool end of the cylinder is a head 6 of a nose 7 having acentral channel 8 preferably provided with an end socket 9, and threadedinto the opposite end of the cylinder is a head 11 having a reduced,outwardly extending neck 12, both the head and neck being provided witha central channel 13.

ll ixed on the neck 12 is a housing 1 1, having an end cap 15 which isadapted for closing the housing in order that the latter maySpecification of Letters Patent.

Patented Feb, 11-, 191%.

Serial no. 780,431.

be used as a handle for the tool head; the housing being preferablyrigidly secured on the neck 12 by means of screws 16.

Slidably mounted in the chanels 8 and 13, in the head members of therespective ends of the cylinder 1, is a shaft 18, the outer end of whichterminates in the squared socket 9, while the inner end is projectedinto the housing 1% and carries washers 19 and bolts 20, whereby theoutward travel of the shaft is limited, and whereby such limit may bevaried when required.

Fixed on the shaft 18, within the housing, is a stop 22, and surroundingthe shaft and bearing against the stop and the inner face of the head 11is a coil spring 23, whereby the shaft is normally yieldingly tensionedto its outer position. i

Revolubly mounted on the shaft, at the outer side of the stop 22, is acollar hav' ing a plane outer face 26 and cupped inner face 27 inclosinga ball race for confining the anti-friction members 28 which bearagainst the shaft and space the collartherefrom, so that the collar mayrevolve freely on the shaft.

Threaded into the port casing a is a cap 30, having a central aperture31, and having a wrench head 32 on its outer face, whereby it may betightened or loosened from its seat in said casing.

Revolubly mounted in the central aperture 81 of the port cap is a shaft84, having collars 35 fixed thereon and adapted for con lining same inthe cap 30, so as to obviate longitudinal movement without interferingwith its rotation. Also fixed on the outer end of the shaft 34 is a head36 adapted for connection with a flexible shaft, or other driving means,and fixed on the inner end of the shaft is a cam 37 which is adapted forcontact with the outer face of the collar 26 on the reciprocatory shaft18 once during each revolution of the shaft 34, in order to force thecollar and the reciprocatory shaft back against the tension of thespring 23, and which is adapted for relieving the collar and shaft tothe tension of the spring after the contact therewith is broken, so thatthe shaft is reciprocated rearwardly by positive driving action from thecam, and forwardly under the spring tension.

38 designates a tool having a squared end 39 adapted to seat in thesocket 9 and for engagement by the outer end of the reciproshown.

catory shaft in order to drive the tool and cause same to impact againstthe object upon which it is being used; the present drawingsillustrating the tool as an ordinary rock drill, although it is quiteapparent that any suitable tool may be used in place of the one In usingthe device, presuming the parts to be constructed and assembledasdescribed, and the driving shaft 34 connected with a source of power anda suitable tool located in the socket provided therefor, when the poweris on, the shaft 34 is revolved and the cam 37 brought into contactwiththe collar 25, so that the collar and reciprocatory shaft are movedbackwardly against the tension of the spring 28;there being sufiicientroom in the housing to permit such reciprocation, and the channel in theouter head being of sufficient length to prevent the escape of the shaft18 therefrom. After the cam has moved the collar and shaft back againstthe spring, further rotation causes the cam to leave its contact withthe collar, so that the collar and shaft are moved forwardly by thespring; the outer end of the shaft stnlnng agamst the inner end of thetool to produce a blow oi the tool against the matenal upon which 1t isworking. it 1s apparent that when the shaft 34.- is revolved rapidly,the reciprocation of the shaft 18 will also be rapid, and that theworking blows will follow each other in rapid sequences.

7 Copies 01 this patent may be obtained for on the shaft and therebyobviate wearing of its outer face by contact with the cam, and that ifso desired the socket 9 maybe cylindrical in order that the tool may berevolved therein while it is in operation.

Having thus described my invention, what I claim as new therein, anddesire to secure by Letters-Patent, is

An impact tool head comprising a hollow 1 body having channeled heads atopposite ends, one of said heads having a tool socket communicating withits channel and the other head comprising an outwardly directed neck, ahousing fixed on said neck, a shaft adapted for reciprocatory travel inthe head channels and having one end projected into said socket and theother end into said housing, locking means on said shaft within thehousing, a stop on said shaft within the body, a spring bearing againstsaid stop and adjacent the head, a collar loosely mounted on said shaftand adapted for contacting the stop, a cap mounted on said body andhaving a channel opening into the interior thereof,

five cents each, by addressing the Commissioner of Patents, Washington,D. 0.

